SO_DOCUMENT_SEND_API1, sending a text attachment.

Hello all,

I need to send the following text as a txt file attachment in an email :

1 A

2 B

3 C

but what i receive in the email attachment was:

1 A 2 B 3 C

everything in a single line.. which is not what i want...

bellow is part of my code....

CONSTANTS:

con_tab TYPE C VALUE cl_abap_char_utilities=>HORIZONTAL_TAB,

con_cret TYPE C VALUE

cl_abap_char_utilities=>CR_LF.

CONCATENATE '1 ' 'A' INTO it_attach SEPARATED BY con_tab.

CONCATENATE con_cret it_attach INTO it_attach.

APPEND it_attach.

CONCATENATE '2 ' 'B' INTO it_attach SEPARATED BY con_tab.

CONCATENATE con_cret it_attach INTO it_attach.

APPEND it_attach.

CONCATENATE '3 ' 'C' INTO it_attach SEPARATED BY con_tab.

CONCATENATE con_cret it_attach INTO it_attach.

APPEND it_attach.

......

......

......

CALL FUNCTION 'SO_DOCUMENT_SEND_API1'

EXPORTING

document_data = w_doc_data

put_in_outbox = 'X'

sender_address = ld_sender_address

sender_address_type = ld_sender_address_type

commit_work = 'X'

IMPORTING

sent_to_all = w_sent_all

TABLES

packing_list = t_packing_list

contents_bin = t_attachment

contents_txt = it_message

receivers = t_receivers

EXCEPTIONS

too_many_receivers = 1

document_not_sent = 2

document_type_not_exist = 3

operation_no_authorization = 4

parameter_error = 5

x_error = 6

enqueue_error = 7

OTHERS = 8.

thank you..